Final answer:
To find the percentage of variation accounted for by the 6 variables in the average ladder scores among countries, a regression analysis needs to be performed to calculate the coefficient of determination (R-squared).
Step-by-step explanation:
In order to find the percentage of variation accounted for by the 6 variables in the average ladder scores among countries, we need to calculate the coefficient of determination, also known as R-squared. R-squared represents the proportion of the dependent variable's variation that is explained by the independent variables. In this case, the independent variables are the 6 variables being considered.
To calculate R-squared, we need to perform a regression analysis. By running a regression analysis on the average ladder scores with the 6 variables as independent variables, we can obtain the R-squared value. This value will tell us the proportion of variation in the average ladder scores that is accounted for by the 6 variables.
For example, if the R-squared value is 0.80, it means that the 6 variables explain 80% of the variation in the average ladder scores among countries.